LSENLTY Carbon Monoxide Detectors Support 3 Years Standby Time for Home and Travel, 4 Pack-CDR-817

Portable Carbon Monoxide Detector: compact size, dimension 8.1*5*2.7cm, weight 80g, with mesh bag (the mesh bag is at the bottom of the box, don't forget to open the plastic layer inside the package), adhesive lining and fixing screws. CO Concentration Range: The detection range of the co detector is 0-999PM. Updated every 3 seconds. If the concentration exceeds 50PPM, the product will sound an alarm within 60-90 minutes. If the concentration exceeds 100PPM, the product will sound an alarm within 10-40 minutes. If the concentration exceeds 300 ppm, the product will sound an alarm within 3 minutes. 3-Year Standby Time: The carbon monoxide detector is equipped with a battery that has a battery life of up to 3 years. Indicator Light Means: The green indicator light flashes to indicate that the product is continuously detecting the carbon monoxide concentration in the surrounding environment and is updating the value every 3 seconds. A red indicator light indic